single packaged — m4pw4...placing the unit in the cooling mode to defrost the outdoor coil. the...
Post on 18-Mar-2020
1 Views
Preview:
TRANSCRIPT
SSAAFFEETTYYWWAARRNNIINNGGOnly qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and
air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered
equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all precautions in the
literature and on the tags, stickers, and labels that are attached to the equipment.
May 2016 M4PW4042A-SF-1B-EN
Single Packaged Heat PumpM4PW4042A1000A
XE1200
NNoottee:: Graphics in this document are for representationonly. Actual model may differ in appearance.
Service Facts
©2016 Ameristar M4PW4042A-SF-1B-EN
SAFETY SECTIONIImmppoorrttaanntt— This document contains a wiring
diagram, a parts list, and service information. This is
customer property and is to remain with this unit.
Please return to service information pack upon
completion of work.
WWAARRNNIINNGGHHAAZZAARRDDOOUUSS VVOOLLTTAAGGEE!!FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr ddeeaatthh..
DDiissccoonnnneecctt aallll eelleeccttrriicc ppoowweerr,, iinncclluuddiinngg rreemmoottee
ddiissccoonnnneeccttss bbeeffoorree sseerrvviicciinngg.. FFoollllooww pprrooppeerr
lloocckkoouutt//ttaaggoouutt pprroocceedduurreess ttoo eennssuurree tthhee ppoowweerr
ccaannnnoott bbee iinnaaddvveerrtteennttllyy eenneerrggiizzeedd..
WWAARRNNIINNGGSSAAFFEETTYYAANNDD EELLEECCTTRRIICCAALL HHAAZZAARRDD!!FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr ddeeaatthh..
TThheessee sseerrvviicciinngg iinnssttrruuccttiioonnss aarree ffoorr uussee bbyy
qquuaalliiffiieedd ppeerrssoonnnneell oonnllyy.. TToo rreedduuccee tthhee rriisskk ooff
eelleeccttrriiccaall sshhoocckk,, ddoo nnoott ppeerrffoorrmm aannyy sseerrvviicciinngg
ootthheerr tthhaann tthhaatt ccoonnttaaiinneedd iinn tthheessee ooppeerraattiinngg
iinnssttrruuccttiioonnss uunnlleessss yyoouu aarree qquuaalliiffiieedd ttoo ddoo ssoo..
CCAAUUTTIIOONNGGRROOUUNNDDIINNGG RREEQQUUIIRREEDD!!FFaaiilluurree ttoo iinnssppeecctt oorr uussee pprrooppeerr sseerrvviiccee ttoooollss mmaayy
rreessuulltt iinn eeqquuiippmmeenntt ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy..
RReeccoonnnneecctt aallll ggrroouunnddiinngg ddeevviicceess.. AAllll ppaarrttss ooff tthhiiss
pprroodduucctt tthhaatt aarree ccaappaabbllee ooff ccoonndduuccttiinngg eelleeccttrriiccaall
ccuurrrreenntt aarree ggrroouunnddeedd.. IIff ggrroouunnddiinngg wwiirreess,, ssccrreewwss,,
ssttrraappss,, cclliippss,, nnuuttss,, oorr wwaasshheerrss uusseedd ttoo ccoommpplleettee aa
ppaatthh ttoo ggrroouunndd aarree rreemmoovveedd ffoorr sseerrvviiccee,, tthheeyy mmuusstt
bbee rreettuurrnneedd ttoo tthheeiirr oorriiggiinnaall ppoossiittiioonn aanndd pprrooppeerrllyy
ffaasstteenneedd..
WWAARRNNIINNGGUUNNIITT CCOONNTTAAIINNSS RR--441100AA
RREEFFRRIIGGEERRAANNTT!!FFaaiilluurree ttoo uussee pprrooppeerr sseerrvviiccee ttoooollss mmaayy rreessuulltt iinn
eeqquuiippmmeenntt ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy..
RR--441100AA ooppeerraattiinngg pprreessssuurree eexxcceeeeddss tthhee lliimmiitt ooff RR--
2222.. PPrrooppeerr sseerrvviiccee eeqquuiippmmeenntt iiss rreeqquuiirreedd.. SSeerrvviiccee
uussiinngg oonnllyy RR--441100AA RReeffrriiggeerraanntt aanndd aapppprroovveedd PPOOEE
ccoommpprreessssoorr ooiill..
WWAARRNNIINNGGSSAAFFEETTYY HHAAZZAARRDD!!OOppeerraattiinngg tthhee uunniitt wwiitthhoouutt tthhee aacccceessss ppaanneellss
pprrooppeerrllyy iinnssttaalllleedd mmaayy rreessuulltt iinn sseevveerree ppeerrssoonnaall
iinnjjuurryy oorr ddeeaatthh..
DDoo nnoott ooppeerraattee tthhee uunniitt wwiitthhoouutt tthhee eevvaappoorraattoorr ffaann
aacccceessss ppaanneell oorr eevvaappoorraattoorr ccooiill aacccceessss ppaanneell iinn
ppllaaccee..
IImmppoorrttaanntt:: Wear appropriate gloves, arm sleeveprotectors and eye protection whenservicing or maintaining this equipment.
IImmppoorrttaanntt:: Air filters and media wheels or plates shallmeet the test requirements in UL 900.
M4PW4042A-SF-1B-EN 3
Product Specifications
MODEL M4PW4042A1000A
RATED Volts/PH/Hz 208–230/1/60
Performance Cooling BTUH (a) 39500
Indoor Airflow (CFM) 1200
Power Input (KW) 3.27
EER/SEER (BTU/Watt-Hr.) (b) 11.0 / 14.0
Sound Power Rating [dB(A)] (c) 75
Performance (Heating)
(High Temp.) BTUH— C.O.P. 35000— 4.37
Power Input (KW) 2.94
(Low Temp.) BTUH— C.O.P. 21200— 2.26
Power Input (KW) 2.75
HSPF (BTU / Watt-Hr.) 8POWER CONN.V/Ph/Hz 208–230/1/60
Min. Brch. Cir. Ampacity (d) 30.5
Fuse Size — Max. (amps) 45
Fuse Size — Recmd. (amps) 45
COMPRESSOR SCROLL
No. Used — No. Speeds 1 — 1
Volts/Ph/Hz 208–230/1/60
R.L. Amps — L.R. Amps 16.7 / 109
OUTDOOR COIL — TYPE PLATE FIN
Rows/F.P.I 2 / 22
Face Area (sq. ft.) 12.3
Tube Size (in.) 3/8
Refrigerant Control TXV—NB
INDOOR COIL — TYPE PLATE FIN
Rows/F.P.I 5 / 15
Face Area (sq. ft.) 3.44
Tube Size (in.) 3/8
Refrigeration Control TXV—NB
Drain Conn. Size (in.) 3/4 FEMALE PVC
Duct Connections SEE OUTLINE DRAWING
OUTDOOR FAN— TYPE PROPELLER
No. Used/Dia. (in) 1 / 20
Type Drive/No. Speeds ECM / 1
CFM@ 0.0 in. w.g. (e) 2600
No. Motors — HP/RPM 1 / 1/3 / 850
Volts/Ph/Hz 208–230/1/60
F.L. Amps 2.8
INDOOR FAN— TYPE CENTRIFUGAL
Dia. x Width (in.) 10 X 10
No. Used 1
Drive / Type / Speeds (No.) DIRECT / VSPD / 3
CFM@ 0.0 in. w.g. (f) SEE FAN PERF TABLE
Motor — HP/R.P.M. 1/ 0.75 / VARIABLE
Volts/Ph/Hz 208–230/1/60
F.L. Amps 6.8
FILTER / FURNISHED NO
Type Recommended THROWAWAY
Recmd. Face Area (sq. ft) (g) 4.67
REFRIGERANT R-410
Charge (lbs.) 8.7
Subcooling 10° F
DIMENSIONS H X D XW
Crated (in.) 36 X 33–13/16 X 48
WEIGHT
Shipping (lbs.) / Net (lbs.) 353 / 306(a) Rated in accordance with AHRI Standard 210/240.(b) Rated in accordance with D.O.E. test procedure.(c) Sound Power values are not adjusted for AHRI 270–95 tonal
corrections.(d) Calculated in accordance with currently prevailing Nat’l Electrical
Code.(e) Standard Air — Dry Coil — Outdoor.(f) Standard Air — Dry Coil — Indoor(g) Filters must be installed in return air stream. Square footages listed
are based on 300 f.p.m. face velocity. If permanent filters are usedsize per manufacturer’s recommendation with a clean resistance of0.05” W.C.
4 M4PW4042A-SF-1B-EN
Outline Drawing
M4PW4042A-SF-1B-EN 5
Pressure Curves
Figure 1. M4PW4042A1
gnitaeHgnilooCMFC 0021MFC 0021
DIS
CH
AR
GE
PR
ES
SU
RE
(P
SIG
)
OUTDOOR TEMPERATURE (Degree F)
SU
CT
ION
PR
ES
SU
RE
(P
SIG
)
OUTDOOR TEMPERATURE (Degree F)COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 65 DEG F.TO CHECK COOLING PERFORMANCE, SELECT THE PROPER INDOOR CFM, ALLOW PRESSURES TO STABILIZE. MEASURE INDOOR WET BULB TEMPERATURE, OUTDOOR TEMPERATURE, DISCHARGE AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1); LOCATE INDOOR WET BULB (2); FIND INTERSECTION OF OD TEMP. & ID W.B. (3); READ DISCHARGE OR SUCTION PRESSURE IN LEFT COLUMN (4).
EXAMPLE: (1) OUTDOOR TEMP. 82 F. (2) INDOOR WET BULB 67 F. (3) AT INTERSECTION ACTUAL: (4) DISCHARGE PRESSURE @ 1200 CFM CFM IS 334 PSIG DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART (5) SUCTION PRESSURE @ 1200 CFM CFM IS 143 PSIG SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
DWG.NO . M4PW4042A1
110
115
120
125
130
135
140
145
150
155
160
165
170
40 60 80 100 120
200
250
300
350
400
450
500
550
40 60 80 100 120
(1)
(1)
(3)
(3)
(5)
(4)
(2)
(2)INDOOR ENTERINGWET BULB CURVESTOP TO BOTTOM 71, 67, 63 AND 59 DEG F.
INDOOR ENTERINGWET BULB CURVESTOP TO BOTTOM 71, 67, 63 AND 59 DEG F.
30
40
50
60
70
80
90
100
110
120
130
140
-5 5 15 25 35 45 55 65
200
225
250
275
300
325
350
375
400
-5 5 15 25 35 45 55 65
INDOOR ENTERINGDRY BULB CURVESTOP TO BOTTOM 80, 70, AND 60 DEG F.
INDOOR ENTERINGDRY BULB CURVESTOP TO BOTTOM 80, 70, AND 60 DEG F.
6 M4PW4042A-SF-1B-EN
Sequence of OperationGGeenneerraall
Operation of the system heating and cooling cycles is
automatic when the system is in the HEATor COOL
functions (the optional automatic changeover
thermostat, when in the AUTO position, automatically
changes to heat or cool with an appropriate room
temperature change). The fan switch can be placed in
the ON position, causing continuous evaporator
(indoor) fan operation or placed in the AUTO position
causing fan operation to coincide with heating or
cooling run cycles.
CCoooolliinngg MMooddee
Note that the TSH and TSC are contacts that are
internal to the indoor thermostat.
With the disconnect switch is in the ON position,
current is supplied to the control transformer. The
cooling cycle is enabled through the low voltage side of
the control transformer to the “R” terminal on the
indoor thermostat. With the system switch in the AUTO
position and TTSSCC--11 contacts closed, power is supplied
to the “OO” terminal on the indoor thermostat to the
switch-over valve coil ((SSOOVV)). This energizes the switch-
over valve ((SSOOVV)) and places it in the cooling position
(it is in the heating position when de-energized).
When the indoor temperature rises 1–1/2 degrees, TTSSCC--
22 contacts close, supplying power to the “YY” terminal
on the indoor thermostat, and to the compressor
contactor ((CCCC)). This starts the outdoor fan motor and
compressor. The TTSSCC--22 contacts also provide power to
the “GG” terminal which provides power to the indoor
fan motor.
HHeeaattiinngg MMooddee
With the disconnect switch in the ON position, current
is supplied to the control transformer. Starting at the
“RR” terminal on the indoor thermostat, current goes
through the system switch (which is in AUTO position)
to the TSH-1 contacts. When closed, these contacts
supply power to terminal “YY”on the indoor thermostat.
Power is provided from “YY” to the compressor
contactor ((CCCC)) which starts the compressor and
outdoor fan motor. The indoor thermostat contact TTSSHH--
11 also provides power to “GG” terminal on the indoor
thermostat energizing the indoor fan motor.
SSuupppplleemmeennttaarryy HHeeaatt
The supplementary electric heat is brought on when
the indoor temperature drops 1–1/2 degrees below the
thermostat setting. TTSSHH--22 contacts close providing
power to the “WW” terminal on the indoor thermostat
and to the supplementary heater control circuit. An
outdoor thermostat may have been added to disallow
the second stage (if provided) of electric heat above a
selected outdoor temperature. If the outdoor
temperature falls below the setting on the outdoor
thermostat this additional heater stage will come on.
When the outdoor air temperature rises, and the
outdoor T-stat setpoint is reached, the system will
revert back to first stage electric heating.
When the indoor ambient is satisfied, TTSSHH--22 contacts
will open and the unit will revert back to the
compressor only heating mode and then off. For
eemmeerrggeennccyy hheeaatt (use of supplementary electric heat
only), and emergency ((EEMMEERRGG)) heat switch is
provided within the thermostat. When placed in the
emergency heat position, it will disable the
compressor, bypass the outdoor thermostats, if
provided, and engage the supplementary electric
heaters and indoor fan.
DDeemmaanndd DDeeffrroosstt OOppeerraattiioonn
During the heating cycle, the outdoor coil may require
a defrost cycle which is determined by the demand
defrost control ((DDFFCC)). This control continuously
measures the outdoor coil temperature ((CCBBSS)) and the
outdoor ambient temperature ((OODDSS--BB)) and calculates
the difference or delta-T measurement. When the
calculated delta-T is met, the demand defrost control
((DDFFCC)) opens the circuit to the outdoor fan motor
((OODDMM)) and energizes the switch-over valve ((SSOOVV)),
placing the unit in the cooling mode to defrost the
outdoor coil. The outdoor coil temperature sensor
((CCBBSS)) terminates the defrost cycle, or times out after
fifteen minutes in defrost, the ((DDFFCC)) energizes the
outdoor fan motor ((OODDMM)) and twelve seconds later de-
energizes the ((SSOOVV)), which returns the unit to the
heating mode. Supplementary electric heat, if
provided, is brought on to control indoor temperature
during the defrost cycle.
DDeeffrroosstt CCoonnttrrooll
The demand defrost control measures heat pump
outdoor ambient temperature with sensor located
outside the outdoor coil. A second sensor located on
the outdoor coil is used to measure the coil
temperature. The difference between the ambient and
the colder coil temperature is the difference or delta-T
measurement. This delta-T measurement is
representative of the operating state and relative
capacity of the heat pump system. Measuring the
change in delta-T determines the need for defrost. The
coil sensor also senses outdoor coil temperature for
termination of the defrost cycle.
NNoottee:: Refer to the Service Facts for fault detecting, testsensor and checkout procedures.
M4PW4042A-SF-1B-EN 7
EECCMM FFaann MMoottoorr AAddjjuussttmmeennttss ((MM44PPWW44004422 OONNLLYY))
If the airflow needs to be increased or decreased, see
the Airflow Table in the Service Facts. Information on
changing the speed of the blower motor is in the
Blower Performance Table.
Blower speed changes are made on the ICM Fan
Control mounted in the control box. The ICM Fan
Control controls the variable speed motor.
There is a bank of 8 dip switches located at the upper
left side of the board. The dip switches work in pairs to
match the cooling/heat airflow (CFM/TON), Fan off-
delay options, and electric heat airflow adjustment.
Figure 2. ECM Fan Control
CFM SELECTIONLIGHT
DIP SWITCHES
Figure 3. Field Hookup Diagram (With Supplementary Heaters)
NOTES:
1. Fused Disconnect siz e, power wiring and grounding equipment must comply with local codes.2. Be sure power supply agrees with equipment and heater nameplate.3. Low v oltage wring to be no . 18 a wg minimum conductor4. See heater nameplate for current r ating of heater used.5. See u nit and heater diagr am for electrical connection details
PACKAGEDAIR CONDITIONE RTYPICAL
MANUALTHERMOSTAT
PACKAGEDAIR CONDITIONE R
GROUND W IRE
POLARI ZEDPLUG
GROUNDINGWI RE
GROUNDINGWI RE
HEATERFUSE BOX
1 PH. POWER SUPPLYTHRU FUSEDDISCONNE CTPER LOCAL CODES
INTE R-COMPONENT WI RI NG
POLARI ZEDPLUG
SUPPLY HTR.CONTROL BOX
POWER SUPPLY THRUFUSED DISCONNE CTPER LOCAL CODES
POWER SUPPLY ANDCIRCUIT PRO TECTION
DISCONNECT PER LOCAL CODES
FACTORY WIR ING
FIELD WIRING
SUPPLY HTR.CONTROL BOX
17. 28 K W 1 PH. HEATER FUSE BOX FACTORY PROVI DED
1 PH.POWER SUPPLY
3 PH.
1 PH.POWER SUPPLY
COMMON
FAN
COMPRESSOR
ELECTRIC HEAT
SWIT CHOVER VALVE
DEFROST CONTROL “T” SIGNAL
36B (BL)
47A (BK)
44A (YL)
41A (BR)
40A (OR)
48A (BR)
35A (RD)24V
B
G
Y
W
X2
O
T
R
B
G
Y
W
X2
O
T
R3 3
2 2
FFiinnaall IInnssttaallllaattiioonn CChheecckklliisstt
IImmppoorrttaanntt:: Perform a final unit inspection to be surethat factory tubing has not shifted duringshipment. Adjust tubing if necessary sotubes do not rub against each other whenthe unit runs. Also be sure that wiringconnections are tight and properly secured.
Does the unit run and operate as described in the
Sequence of Operation section in response to the
room thermostat?
Are the condenser fan and indoor blower operating
correctly with proper rotation and without undue
noise?
Is the compressor operating correctly and has the
system been checked with a charging chart?
Has the voltage and running current been checked
to determine if it is within limits?
Has the thermostat been checked for calibration
and the air discharge grills adjusted to balance the
system?
Has the ductwork been checked for air leaks and
condensation?
Has the heating air temperature rise been checked?
Has the unit been checked for tubing and sheet
metal rattles? Are there any other unusual noises to
be checked?
Are all covers and panels in place and properly
fastened?
Has the owner been instructed on the proper
operation and maintenance of the unit? Be sure to
leave this manual with the owner.
SSeeqquueennccee ooff OOppeerraattiioonn
8 M4PW4042A-SF-1B-EN
Table 1. Defrost Board Sensor Table
Temperature Relation to Resistance and D.C. Voltage
TEMP (°F) RESISTANCE DC Voltage± 15%
85 8.04K 0.83 VDC
80 9.10K 0.92 VDC
75 10.24K 1.01 VDC
70 11.59K 1.12 VDC
65 13.14K 1.24 VDC
60 14.93K 1.36 VDC
55 17.00K 1.50 VDC
50 19.41K 1.64 VDC
45 22.20K 1.80 VDC
40 25.45K 1.96 VDC
35 29.25K 2.13 VDC
30 33.70K 2.32 VDC
25 38.93K 2.51 VDC
20 45.08K 2.70 VDC
15 52.34K 2.90 VDC
10 60.93K 3.09 VDC
5 71.12K 3.29 VDC
0 83.27K 3.48 VDC
MaintenanceOOwwnneerr MMaaiinntteennaannccee
Some of the periodic maintenance functions of the unit
can be performed by the owner; this includes replacing
the disposable or cleaning the permanent air filters,
cleaning the unit cabinet, cleaning the condenser coil,
and conducting a general unit inspection on a regular
basis.
FFiilltteerrss
When the system is in constant operation, inspect the
filters at least once each month.
If the unit has disposable-type filters, replace them with
new filters of the same type and size. DDoo nnoott aatttteemmpptt
ttoo cclleeaann ddiissppoossaabbllee ffiilltteerrss..
Permanent-type filters can be cleaned by washing them
with a mild detergent and water. Make sure that the
filters are thoroughly dry before reinstalling them in
the unit (or duct system).
NNoottee:: It may be necessary to replace permanent filtersannually if washing fails to clean the filter or ifthe filter shows signs of deterioration. Be sure touse the same type and size as was originallyinstalled.
CCoonnddeennsseerr CCooiill
Be sure to keep all vegetation and debris away from the
condenser coil area.
SSeerrvviiccee MMaaiinntteennaannccee
CCoooolliinngg SSeeaassoonn
To keep the unit operating safely and efficiently, the
manufacturer recommends that a qualified service
technician check the entire system at least once each
year or sooner if needed. The service technician should
examine these areas of the unit:
• filters (for cleaning or replacement)
• motors and drive system components
• safety controls (for mechanical cleaning)
• electrical components and wiring (for possible
replacement and connection tightness)
• condensate drain (for proper sealing and cleaning)
• unit duct connections (to see that they are
physically sound and sealed to the unit casing)
• unit mounting support (for structural integrity)
• the unit (for obvious unit deterioration)
HHeeaattiinngg SSeeaassoonn
Complete the following unit inspections and service
routines at the beginning of each heating season.
• Visually inspect the unit to ensure that the airflow
required for combustion and condenser coil is not
obstructed from the unit.
• Inspect the control panel wiring to verify that all
electrical connections are tight and that the wire
insulation is intact.
SSeeqquueennccee ooff OOppeerraattiioonn
M4PW4042A-SF-1B-EN 9
Important Product InformationRegistering your products helps provide you with one
of the strongest manufacturer limited warranties
available. To register, go to the manufacturer’s website
or contact your dealer. You will need the serial number,
model number, and installation date for each product
being registered. Your dealer may have included these
on your invoice or can provide a list for you to use.
Please take a few moments to record the following
information to ensure your product registration
process is quick and easy:
Packaged Unit Serial Number_____________________________________________________
Packaged Unit Model Number_____________________________________________________
Date of Installation_______________________________________________________________
Dealer___________________________________________________________________________
Service Information
Call your installing dealer if the unit is inoperative. Before you call, always check the following to be sure service is required:
1. Be sure the main switch that supplies power to the unit is in the ON position.
2. Replace any burned-out fuses or reset circuit breakers.
3. Be sure the thermostat is properly set.
Service Phone ___________________________________________________________________
SSeeqquueennccee ooff OOppeerraattiioonn
10 M4PW4042A-SF-1B-EN
Wiring Diagram
M4PW4042A-SF-1B-EN 11
WWiirriinngg DDiiaaggrraamm
12 M4PW4042A-SF-1B-EN
Defrost Control
DDeeffrroosstt CCoonnttrrooll
The demand defrost control measures heat pump
outdoor ambient temperature with a sensor located
outside the outdoor coil. A second sensor located on
the outdoor coil is used to measure the coil
temperature. The difference between the ambient and
the colder coil temperature is the difference or delta-T
measurement. This delta-T measurement is
representative of the operating state and relative
capacity of the heat pump system. Measuring the
change in delta-T determines the need for defrost. The
coil sensor also serves to sense outdoor coil
temperature for termination of the defrost cycle.
FFaauulltt DDeetteeccttiioonn
A fault condition is indicated by the flashing Fault LED
light on the defrost control board located inside the
heat pump control box.
In normal operation, the status LED will flash once each
second when idle or twice each second with a call for
heating or cooling.
PPIINN IIddeennttiiffiiccaattiioonn
1. TEST_COMMON (Shorting any of the other pins to
this pin causes the function of the other pin to be
executed. Leaving this pin open results in the
normal mode of operation).
2. FRC_DFT = Forced Defrost (Short TEST_COMMON
to this pin speeds up all defrost. Remove the short
after defrost initiates.
DDeeffrroosstt CCoonnttrrooll CChheecckkoouutt
Normal operation requires:
a. Status LED on board flashing 1 time/second in
standby or 2 times/second with a call for heating or
cooling.
b. 24VAC between R & B
c. 24V AC between Y, Y0 & B with unit operating
d. Defrost initiation when FRC_DFT pin is shorted to
TEST_COMMON pin.
D158286B
TTeesstt SSeennssoorrss
Measure the temperature the subject sensor is exposed
to. If the sensor is mounted on a tube, place the lead on
an Annie A-8 (or equiv.) temperature tester on the
same tube near the sensor and insulate the bulb.
Unplug the sensor and measure the resistance with a
good quality ohmmeter (Simpson 260 or equiv.). Read
the value as quickly as possible to prevent the meter
current from changing the resistance reading.
Using the chart in , locate (as close as possible) the
actual sensor temperature. The measured resistance
should be relatively close to the resistance value
shown in the chart.
M4PW4042A-SF-1B-EN 13
Table 2. Defrost Control Thermistor Table
TEMP °F TEMP °CTHERMISTORRESISTANCE(OHMS)
Vo (Volts)
-15.00 -26.11 135976 2.50
-10.00 -23.33 115112 2.40
-5.00 -20.56 97745 2.29
0.00 -17.78 83247 2.17
5.00 -15.00 71108 2.05
10.00 -12.22 60916 1.93
15.00 -9.44 52333 1.81
20.00 -6.67 45076 1.69
25.00 -3.89 38927 1.56
30.00 -1.11 33703 1.45
35.00 1.67 29253 1.33
40.00 4.44 25452 1.22
45.00 7.22 22198 1.12
50.00 10.00 19405 1.02
55.00 12.78 17002 0.93
60.00 15.56 14930 0.85
65.00 18.33 13138 0.77
70.00 21.11 11586 0.70
Table 2. Defrost Control Thermistor Table (continued)
75.00 23.89 10238 0.63
80.00 26.67 9065 0.57
85.00 29.44 8043 0.52
90.00 32.22 7150 0.47
95.00 35.00 6368 0.42
100.00 37.78 5682 0.38
105.00 40.56 5079 0.35
110.00 43.33 4548 0.31
115.00 46.11 4079 0.28
120.00 48.89 3665 0.26
125.00 51.67 3298 0.23
130.00 54.44 2972 0.21
135.00 57.22 2683 0.19
Example:
Sensor temp. = 19°F
Measured Resistance = 46K ohms
This sensor is good since the measured value is
relatively close to the chart value.
Table 3. DEMAND DEFROST QUICK SPECS
COMPRESSOR SCROLL SCROLL
MNEMONIC NO CNT 07255 07256
GROUP NOMENCLATURE (a) G01 G02
SUPERSEDURE CNT NA NA
OD FAN TYPE – PSC/ECM PSC ECM
1-SPD 1-SPD
DEFROST ENABLED: Y = ONCOIL TEMPERATURE = ≤52 °F (b) ≤52 °F
DEFROST PERMIT: Y = ONCOIL TEMPERATURE = ≤32 °F ≤32 °F
MIN DEFROST TIME (MINUTES) 1 1
TARGET DEFROST TIME (MINUTES) 4 4
MAX TIME OVERRIDE (MINUTES) 15 15
DEFROST TERMINATE COIL TEMPERATURE (Factory Setting) 47°F 47°F
DEFROST HI TERMINATE COILTEMPERATURE (Cut Jumper 2) 70° F 70°F
SOV SWITCH-OVER DELAY AFTER DEFROST TERM. (SECONDS) 12 12
DEFEAT SWITCH-OVER DELAY (SECONDS) (Cut Jumper 2) 0 0
LOWAMBIENT HEAT PUMP LOCK OUT -7° F -7° F
LOW AMBIENT HEAT PUMP RESUME 3° F 3° F
LPCO INPUT TO CONTROL YES YES
LPCO BYPASS IN/OUT DEFROST (MINUTES) 1 1
(a) GROUP suffix for drawing number D158283(b) ≤ (EQUAL OR LESS THAN)
DDeeffrroosstt CCoonnttrrooll
14 M4PW4042A-SF-1B-EN
Table 4. LED FAULT CODES
LEDFAULTCODES
FAULT DESCRIPTIONDEFROSTCONTROLBEHAVIOR
1 FLASHAmbient Temp Sensor is outof range (open/shorted)
Initiate a 15 minuteforced Defrost afterevery 60 minutes ofruntime. See Note 1 &3.
2 FLASHCoil Temp Sensor is out ofrange (open/shorted)
Initiate a 15 minuteforced Defrost afterevery 60 minutes ofruntime. See Note 3.
3 FLASH Low Pressure Switch is open 3 flash goes awaywhen/if LPCO closes
4 FLASHHard Lock Out (can only becleared with power cycle)
Occurs after 4th tripof LPCO. Note 7
5 FLASH Soft Lock Out
5 flash goes awayafter soft lockoutperiods expires. SeeNote 2.
6 FLASHDefrost cycles too closetogether
Heating Short CycleFault triggers 6 flash& 5 flash codes.Follow Soft Lock Outsequence until HardLock Out (4 flash) orcan clear if conditionsno longer exists.
7 FLASH
In Timed Defrost mode.Check Ambient sensorplacement and verify SOV isoperating properly.
Implied sensor fault(calibration/range)set after defrost andreset after 15 minutesrun time after defrost.See Note 5.
8 FLASH
In Timed Defrost mode.Check Coil sensorplacement and verify SOV isoperating properly.
Outdoor temperatureis below -7'F. SeeNote 6.
9 FLASH
Low Ambient Soft Lockout.Outdoor temperaturedropped below 3F. (OFF at-7F/ON at 3F)
Outdoor temperatureis below -7'F. SeeNote 6.
1. Initiate Adaptive/Timed Defrost so long as Coil
Temp Sensor is functional. Monitor actual time in
defrost and add or reduce run time until next forced
defrost based on achieving a 4 minute (+/- 1) defrost
period.
2. 1st LPCO trip results in a 15 minute soft lockout
period.
• 2nd LPCO trip results in a 30 minute soft lockout
period.
• In COOLING mode, 3rd LPCO trip results in a 4
hour soft lockout period (Frozen ID coil).
• 4th LPCO trip results in a hard lockout.
• In HEATING mode, 3rd LPCO trip results in an 18
hour soft lockout period or will clear if ODT rises
above 40F for 30 minutes or more.
• 4th LPCO trip results on a hard lockout.
3. If both Coil Temp Sensor and Ambient Temp Sensor
are failed, initiate a 15 minute forced defrost after
ever 60 minutes of run time.
4. Do not track if Y cycles off or if defrost takes 15
minutes (Max Time Override). Ambient Sensor
reading is monitored at the end of defrost and
should not deviate more than +/-5F. Ambient Sensor
must report a lower temperature than the Coil
Sensor immediately after defrost (Coil Sensor
should always be higher than Ambient Sensor
when defrost terminates).
5. Do not track if Y cycles off or if defrost takes 15
minutes (Max Time Override). Coil Sensor reading
is monitored at the end of defrost and reading must
be less than Ambient Sensor after 15 minutes of run
time.
6. Once ambient drops to -7F or lower, wait 5 minutes
before soft lockout begins. During soft lock out the
Y signal passes through to the X2 output. Resume
operation when ambient temperature rises to 3F or
higher and after a 15 minute soft lockout period
expires.
7. During a Hard Lockout, the X2 relay opens so that
the Y signal does not pass though.
DDeeffrroosstt CCoonnttrrooll
M4PW4042A-SF-1B-EN 15
Indoor Fan PerformanceM4PW4042A1 EXTERNAL STATIC PRESSURE (IN. WG)
AIRFLOWSETTING
DIPSWITCHSETTINGS .20 .30 .40 .50 .60 .70
1 2 3 4 CFM WATTS CFM WATTS CFM WATTS CFM WATTS CFM WATTS CFM WATTS350
CFM/TON Off Off Off On 1235 356 1238 391 1246 433 1245 466 1247 500 1250 538
400 (a)CFM/TON Off Off Off Off 1408 505 1410 529 1415 574 1415 609 1408 637 1380 633
450CFM/TON Off Off Off Off 1572 613 1576 651 1569 683 1545 700 1540 720 1531 738
WET COIL, NO FILTERS(a) FACTORY SETTING
Pressure Drop TableNumber of Racks
AirflowCFM
1 2 3
Air Pressure Drop (Inches of w.g.)
600 0.02 0.04 0.06
700 0.03 0.05 0.07
800 0.03 0.06 0.09
900 0.04 0.08 0.12
1000 0.05 0.10 0.15
1100 0.06 0.12 0.18
1200 0.07 0.14 0.21
1300 0.08 0.17 0.25
1400 0.10 0.20 0.30
1500 0.12 0.23 0.35
Heater Model No. of Racks
BAYHTRC106A 1
BAYHTRC109A 1
BAYHTRC111A 1
BAYHTRC117A 2
16 M4PW4042A-SF-1B-EN
Charging in Cooling above55°F OD Ambient
The preferred method is to weigh in the factory charge
per the unit nameplate. If weighing in the charge is not
practical, the following method can be used. This
charging method is prescribed for systems with indoor
TXVs.
1. For best results — the indoor temperature should
be kept between 70°F to 80°F. Add system heat if
needed.
2. Whenever charge is removed or added, the system
must be operated for a minimum of 20 minutes to
stabilize before accurate measurements can be
made.
3. Measure Liquid Line Temperature and Refrigerant
Pressure at service valved in the compressor
compartment.
4. Determine the Design Subcooling from the unit
nameplate or Service Facts.
5. Locate your liquid line temperature in the left
column of the table, and the intersecting liquid line
pressure under the subcool value column, Add
refrigerant to raise the pressure to match the table,
or remove refrigerant to lower the pressure. Again,
wait 20 minutes for the system conditions to
stabilize before adjusting charge again.
6. When system is correctly charged, you can refer to
System Pressure Curves (on page 2) to verify typical
performance.
R-410A REFRIGERANT CHARGING CHARTRefer to Service Facts or Installer’s Guide for chargingmethod
LIQUIDTEMP(°F)
DESIGN SUBCOOLING (°F)
6 8 9 10 11 12 13 14 16
LIQUID GAGE PRESSURE (PSI)
55 174 179 182 185 188 191 195 198 205
60 189 195 198 201 204 208 211 215 222
65 205 211 215 218 222 225 229 232 240
70 222 229 232 236 240 243 247 251 259
75 240 247 251 255 259 263 267 271 279
80 259 267 271 275 279 283 287 291 301
85 279 287 291 296 300 304 309 313 323
90 301 309 313 318 322 327 331 336 347
95 323 331 336 341 346 351 355 360 371
100 347 355 360 365 370 376 381 386 398
105 371 381 386 391 396 402 407 413 425
110 398 407 413 418 424 429 435 441 454
115 425 435 441 446 452 458 464 470 484
120 454 464 470 476 482 488 495 501 516
125 484 495 501 507 514 520 527 533 549
From Dwg. D154557P01
CChhaarrggiinngg BBeellooww 5555°FF OODD
AAmmbbiieenntt iinn HHeeaattiinngg OOnnllyy
1. The Subcool Charging Method in cooling is NOT
recommended below 55°F outdoor ambient.
2. The only recommended method of charging at
outdoor ambients below 55°F, is to weigh in the
charge in the heating mode.
3. Use Nameplate charge.
4. Check liquid line temperature and pressure (at the
OD valves) to obtain a minimum of the subcooling
shown in the subcooling table.
5. Add charge if the minimum subcooling as shown in
the table is not obtained with the nameplate charge.
6. It is important to return in the spring or summer to
accurately charge the system in the cooling mode at
outdoor ambients above 55°F.
M4PW4042A-SF-1B-EN 17
Refrigerant Circuit
INDICA TES DIRECTION OF REFRIGERANT FLOW
INDOORSECTION EXPANSION
VALVE BULB
SUCTIONSERVICE VALVE
I.D .COIL
EQ
UA
LIZ
ER
BA
RR
IER
DISCHARGELINE
D
S
COMPRESSORSUCTIONLINE
DRIER
EXPANSION V ALVE
SWIT CHOVERVALVE
OUTDOORSECTION EQUALIZER
LINE
EXPANSIONVALVE BULB
O.D.COIL
DISTRIBUT OR
DEFROSTSENSOR
EXPANSIONVALVE
LIQUID LINESERVICE VALVE
INDICA TES DIRECTION OFREFRIGERANT FLOW
INDOORSECTION
SUCTION SERVICE VALVE
I.D .COIL
HEATING REFRIGERANT CYCLE
SWIT CHOVERVALVE
OUTDOORSECTION
EQUALIZERLINE
EXPANSIONVALVE BULB
O.D.COIL
DEFROSTSENSOR
DISTRIBUT OR
D
S
COMPRESSOR
EQ
UA
LIZ
ER
BA
RR
IER
LIQUID LINESERVICE VALVE
EXPANSIONVALVE
SUCTIONLINE
COOLING REFRIGERANT CYCLE
EXPANSION V ALVE
DRIER
EXPANSIONVALVE BULB
DISCHARGELINE
M4PW4042
18 M4PW4042A-SF-1B-EN
NNootteess
M4PW4042A-SF-1B-EN 19
NNootteess
NNootteess
Ameristar, a brand of Ingersoll Rand, the leader in creating and sustaining safe, comfortable and energy efficient
environments, offers a portfolio of affordable residential HVAC systems and parts. For more information, visit www.
Ameristarac.com
Ameristar has a policy of continuous product and product data improvements and reserves the right to change design and specifications without notice.
©2016 Ameristar
M4PW4042A-SF-1B-EN 13 May 2016
Supersedes M4PW4042A-SF-1A-EN (February 2016)
top related